Myrcene Effects: Sedation, Relaxation, and the Evidence
Myrcene is a terpene in cannabis, hops, and mango. Reported effects include relaxation and sedation, but human data is thin. Here is what studies show.
Short answer
Myrcene lowers several inflammatory markers in cell cultures and in rodents. The markers include nitric oxide, prostaglandin E2, TNF-α, and IL-1β. No published human trial has tested isolated myrcene for an inflammatory condition. The effect is documented in lab models and unproven in people.
What myrcene is
Myrcene is a monoterpene. Formula: C10H16. Molecular weight: 136.23 g/mol. Boiling point: 167 °C. It occurs in hops, lemongrass, bay leaf, thyme, mango, and cannabis. In cannabis flower it is often the most abundant terpene. Published content in dried flower falls between 0.1% and 1% of dry weight in many samples, and above that in some cultivars.
What Does Myrcene Do in Cannabis?
Cell studies
Rufino and colleagues published a 2014 study in the European Journal of Pharmacology. The team treated human chondrocytes with myrcene and interleukin-1β. Myrcene reduced nitric oxide and prostaglandin E2 release. It also lowered NF-κB activation. NF-κB is the transcription factor that switches on COX-2 and iNOS, two enzymes in the inflammatory cascade.
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Animal studies
Bonamin and colleagues tested β-myrcene in mice with ethanol-induced gastric lesions, published in Chemico-Biological Interactions in 2014. Treated mice had smaller lesion areas. TNF-α and IL-1β levels dropped. Myeloperoxidase activity fell, which indicates fewer neutrophils in the tissue.
Lorenzetti and colleagues reported in 1991 that myrcene produced analgesia in mice. Naloxone reversed the effect, which points to opioid receptor involvement. Analgesia is a separate endpoint from inflammation.
Doses in the research
Rodent doses in these papers range from about 10 mg/kg to 200 mg/kg. Route changes the result. Oral gavage, intraperitoneal injection, and topical application give different blood and tissue levels. No validated conversion from these doses to a human equivalent exists.
Human evidence
None. Searches of PubMed return no randomized controlled trial of isolated myrcene for any inflammatory disease. Small human studies of lemongrass tea and hops extracts exist, but those preparations contain many compounds, so they cannot isolate myrcene.
Limits of the whole-plant claim
Smoked and vaporized cannabis delivers terpenes at doses below the animal studies. Combustion destroys or alters part of the terpene load. Cannabis also contains more than 100 cannabinoids, and THC and CBD have their own immune effects. Results from a single terpene do not transfer to a smoked flower product.
Safety and interactions
The FDA lists myrcene as a permitted synthetic flavoring substance under 21 CFR 172.515. In vitro work reports inhibition of cytochrome P450 enzymes, including CYP2B6. Human interaction data are thin. People on narrow-therapeutic-index drugs should treat that as a gap, not a clearance.